Malicious PDF — malware analysis report

Static analysis result for SHA-256 30edbb085c2d6db7…

MALICIOUS

PDF

77.4 KB Created: 2021-09-10 23:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1350e1548c7afcd27ef9868490f860cf SHA-1: 56f9c65672726c7e3db318cc34f84eff61475be0 SHA-256: 30edbb085c2d6db7bf7a95f2f58e065c0af0ad371de82d4202ac36309b10d0d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with high and critical severity heuristics indicating its nature. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the file being a link farm hosted on disposable domains, suggesting a phishing or redirection scheme. While no scripts were extracted, the numerous embedded URLs on potentially untrusted domains strongly indicate a malicious intent to lure users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/kulb13n7r451bnaps3d9tmu9cc/gojasar.pdf In PDF document text
    • http://chinazzjx.com/d/files/sexugopimasejitojamudo.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/gakugavaguzitizus.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/67988881494.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/92288350961.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/vavimokar.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/25553351813.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210907_DE0832AFEA5FD5AA.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/85289464375.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/70007878798.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed02d3b25b---52777101381.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/neluv.pdfIn PDF document text
    • http://gardatrans.com/content/Files/86631563256.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/9181213793.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/14889395153.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210904125738_cyp1xg.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/jivavujopuj.pdfIn PDF document text
    • https://steammining.com/userfiles/file/3554371652.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/nobigupifufuvuzu.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/nebapixevolexewata.pdfIn PDF document text
    • http://yepuco.com/uploads/files/niwujifumipesajopibavop.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/91745410395.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/wesolewo.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/17599222695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+switch+on+android+without+power+buttonPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CD 10884 bytes
SHA-256: 213e7567593f23e5e6bc39125c7ec72f97a043d0ed3ef1bf8a384a185fbda9f8
font_01_sfnt_off0000e1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B4 17956 bytes
SHA-256: 091daf58f28f4ac717b73ff06905a394ab3a7f6a8c741aa44bfe06caa6b9b478
font_02_sfnt_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1